Improvement in apparatus for and -methods of seaming rubber goods



Egg J W. B. CARR. Apparatus for and Method ofseaming Rubber Go'od is T Patented Dec. 9, 1879.

-1Srnrns PATENT OFFICE.

.WILI-JIAM B. CARE, OF BROOKLYN, NEW YORK.

IMPROVEMENT APPARATUS FOR AND-METHODS 0F SEAMING RUBBER GOODS.

neously cutting and firmly uniting in one operation the edges of two pieces of india-rubber, caoutchouc, gutta-percha, or other equivalent gum.

To this end I use a cutting-tool of proper shape, but which is not endless, and bevel its edges to operate it in connection with a cushioned support for the two pieces of india-rub ber or other gum. I

In the accompanying drawings, Figure 1 represents a top view of a cushioned table containing two pieces of india-rubber or other gum to be united and shaped by the'cutter, which is shown in horizontal section. Fig. 2 is a vertical cross-section, on an enlargedscale,

.of the table, cushion, knife, and rubber, on the line a c, Fig. 1. Fig. 3 is a vertical section of the knife shown in Fig. 4. Fig.4 is a bottom viewof a knife of difierent outline from that shown in Fig. 1.

Similar letters of reference indicate corresponding parts in all the figures.

The knife or cutter A has a blade, either continuous, as in Fig. 1, or in sections, as in Fig; 4, the 'outlineof which corresponds to the contour of the pieces of rubber or other gum to be cut out. a

It is an essential feature of my invention that the cutting-edge of the blade be not endless, as it is necessary-to'have oneor more openings, at, therein, for the admission of air between the two sheets of rubber or other gum. J j

It is alsoan essential characteristic of my invention that the knife be;,made with a pronounced bevel, b, above itscutting-edgc. The thicker the rubber or otherzg'um to be out the thicker must be the knife-blade, in order to obtainthe requisite pressure.

Specification forming part-ofLetters Patent No. 222,345, dated December 9, 1879 applicationfiled a March 26, 1879. i

B is the table, which should be quite firm and secure. Oisacushion of asteboard felt,

lead or other su1 a e mat n. u the table B, and held thereto, if. desired, by

' suitable clamps or devices D.

The two sheets E F of india-rubber or other gum (or one sheetmded double) are laid flat upon the cushion G, one sheet or folddirectly adhesive under pressure. My inventlon consists in means for simulta" The knife A, when placed over the indiarubber or other gum, as in Fig. '1, receives a smart blow with a mallet or other tool or means, and is thereby forced through the rubberor other gum, cutting it at-one operation in'the desired manner, and at the same time pressing the cut edges tightly. together by means of the bevel b. When the knife is taken oif the cut edges-will be found to be united more tenaciously than any other part of the rubber or other. gum, so that if the knife is of nearly circular form, as in Fig. 1-, a perfect bag is produced. If the knife is straight or' slightly bent, the incision will vary accord ingly but the result will always be that the cut edges will be firmly and properly united by the pressure of the bevel b, so as to require no other fastening. The rubber or other gum, after having thus been shaped and united, may be further cured or otherwise treated for use in the arts.

It is essential to the success of my invention that the cushion G be used, as otherwise the bevel I) would not be able to properly compress the cut edges of the rubber or other gum.

It is likewise necessary to permit air to enter between the sheets of rubber or other gum during the act of cutting, as otherwise the bulging which takes place byv crowding the cut edges down into the cushion (see Fig. 2) could not take place. I

It will be perceived that by myinvention the united edges of the piece of rubber or other gum are united with equal pressure and in equal degree throughout at one operation.

I am aware that heretofore rubber, tubes were formed by cutting a piece of foldedrubher with a pair of scissors, thereby causing the. cut ends to adhere to a limited extent, but to an unequal degree, as the leverage of the scis- 3. As a new article of manufacture, a bag or article of india-rubber or equivalent gum, composed of two or more pieces, which are united at the edges, at one single operation, with equal pressure and in equal degree throughout, substantially as specified.

The foregoing description of my invention signed by me this 19th day of March, 1879.

WILLIAM BISHOP CARR.

Witnesses T. B. MOSHER, W. G. E. SCHULTZ. 

